<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The fax machines will be talking directly to the spa2102 –
the problem is that Asterisk only supports being a T.38 pass-thru and not an
end-point. And I need the ability to fax over WAN links like ADSL…
so I’ll have a fax machine plugged into a Linksys SPA2102 which will
connect to Asterisk over ADSL, if I route the calls directly to the PRI and use
G.711u for the Linksys <-> Asterisk connection, then any hiccups on the
DSL line are going to cause the fax to potentially get screwed. This is
what T.38 is designed to fix… but since Asterisk doesn’t support
being an end-point… you need something else to do it… that could be
a SIP provider that supports, t38modem, another ATA, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>That’s why our planned setup is way overly complicated…
just to get T.38.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>--<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Matt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>Robert
Augustyn<br>
<b>Sent:</b> Monday, December 10, 2007 4:25 PM<br>
<b>To:</b> 'Asterisk Users Mailing List - Non-Commercial Discussion'<br>
<b>Subject:</b> Re: [asterisk-users] T.38 fax solution, opinions?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>How about fax machines talking directly to spa2102 and then out the
pri or am I missing something?</span><o:p></o:p></p>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>Matt
Watson<br>
<b>Sent:</b> Monday, December 10, 2007 4:06 PM<br>
<b>To:</b> Asterisk Users Mailing List - Non-Commercial Discussion<br>
<b>Subject:</b> Re: [asterisk-users] T.38 fax solution, opinions?</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I;m not sure how your solution would work… but I thought
I’d throw out some ideas that we are having to implementing faxing here
on a new install.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We are going to be bringing in a PRI and routing all the DIDs
from our existing copper lines to the PRI (including fax DIDs)… the
solution we are working towards is certainly not ideal, but we are hopeful its
going to work…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Incoming fax calls will come into Asterisk, asterisk will route
them to IAXmodem which will feed Hylafax (all running on the same box as
Asterisk to reduce latency… and we are talking about fairly small
volumes). Hylafax will then do fax 2 email<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Outbound faxing however is a bit trickier…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We are going to use Linksys ATAs (tested with a SPA2102) which
will have the POTS fax machines plugged into them, the SPA2102 connects to
asterisk with SIP, asterisk will then route the calls to t38modem (recent dev
versions of it support SIP and not only H.323), t38modem is basically just like
IAXmodem except its SIP and supports t38 termination. T38modem will again
feed hylafax, which will then route back to asterisk through IAXmodem and then
up the PRI.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Its certainly not a pretty solution… but we haven’t
come up with anything else yet…. the only step I can see possibly
simplifying is on outbound faxes Hylafax can possibly be bypassed and have
t38modem talk directly to IAXmodem.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>--<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Matt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>arkda<br>
<b>Sent:</b> Sunday, December 09, 2007 11:59 PM<br>
<b>To:</b> Asterisk Users Mailing List - Non-Commercial Discussion<br>
<b>Subject:</b> [asterisk-users] T.38 fax solution, opinions?<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<br>
<br>
I'm putting together a fax solution for my company that utilizes T.38. I wanted
to throw out my plan and get some feedback if anyone is doing something similar
or sees a blatant problem with it.<br>
<br>
We're currently rolling out SPA-942 phones for the standard desk phone with
vanilla Asterisk 1.4.15 (just upgraded it today) on the back end. Most calls
for satellite offices are handled by VoIP providers (for voice Vitelity
inbound, Gafachi outbound). These satellite offices are using a T.38 fax DID
from Gafachi, passed through the Asterisk server to a Linksys 3102 ATA and then
to a POTS fax machine. This all works well thus far. <br>
<br>
Our HQ has a full voice PRI, terminated on the Asterisk server with a TE120P.
Additionally, right now they have five fax lines totally separate from the PRI
that are used for POTS fax machines.<br>
<br>
I'm thinking of porting those numbers to the PRI and purchasing a TDM880B
(comes with eight FXS modules) and routing the fax DIDs to the 880 in Asterisk.
Five of the ports would connect into a Linksys 3102 that would speak T.38 to
what would be our new fax environment (Exchange 2007 Unified Messaging). That
part isn't implemented yet, but it shouldn't be a problem. Once it's
implemented I'll probably reroute the Gafachi T.38 fax DIDs to Exchange through
Asterisk (with sipX in there somewhere).<br>
<br>
The part(s) I'm unsure about is the TDM880B. I haven't used a FXS card with
Asterisk, and I certainly haven't used a fax machine on that FXS. Additionally,
I'm not 100% sure the 3102 will talk directly to Exchange UM yet, but that's
something I can figure out myself soon; I'm just not sure about spending the
cash for a TDM880B without knowing someone has thrown faxes through it from a
PRI terminated on the same box from a separate card. <br>
<br>
Anyway, thoughts, criticisms, insults and stinging barbs all welcome.<o:p></o:p></p>
</blockquote>
</div>
</body>
</html>